Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b24fff173ff727b…

MALICIOUS

PDF

45.2 KB Created: 2021-05-31 12:42:51 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 1d90143e1c68c433f13352241c7d1a6f SHA-1: a95db5d9a4b8f83f1339125bd7df127222739d13 SHA-256: 8b24fff173ff727b305ddb11ef0546e8946e15c32e748b52ab73030fa91b1637
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains multiple links to known malicious redirectors and lures users with promises of game hacks and free currency. The primary URL, https://netcdn.xyz/app/431946152/robux-hack-download-google-chrome-game-hack, is associated with a lure for downloading software. The presence of a visual download button heuristic further supports the social engineering aspect of this attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

Heuristics 4

  • PDF links to a 'free generator / game hack' redirector critical PDF_GAME_HACK_REDIRECT_LURE
    PDF's clickable action targets a redirector of the form /app/<id>/<slug>-game-hack — the landing-page shape of a large SEO 'free spins / generator / game hack' lure family that funnels victims through rotating disposable hosts to a malware/scam payload. The multi-link variants also trip ML/link-farm rules; this catches the single-link variants that otherwise score clean. CRITICAL on its own: the /app/<id>/<slug>-game-hack path shape is unambiguous scam infra, and the host rotates so a host-list match can't be relied on.
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://netcdn.xyz/app/431946152/robux-hack-download-google-chrome-game-hack In PDF document text
    • https://sktc.se/wp-content/uploads/fsqm-files/free-spin-link-for-coin-master-game_GM406889139.pdfIn PDF document text
    • https://sktc.se/wp-content/uploads/fsqm-files/how-to-get-free-robux-for-real_GM431946152.pdfIn PDF document text
    • https://sktc.se/wp-content/uploads/fsqm-files/robux-free-co_GM431946152.pdfIn PDF document text
    • https://sktc.se/wp-content/uploads/fsqm-files/how-to-hack-diamonds-in-royale-high-roblox_GM431946152.pdfIn PDF document text
    • https://sktc.se/wp-content/uploads/fsqm-files/minecraft-bedrock-edition-download-pc-free_GM479516143.pdfIn PDF document text
    • https://sktc.se/wp-content/uploads/fsqm-files/free-robux-working_GM431946152.pdfIn PDF document text
    • https://sktc.se/wp-content/uploads/fsqm-files/roblox-promo-codes-free-robux_GM431946152.pdfIn PDF document text
    • https://sktc.se/wp-content/uploads/fsqm-files/coin-master-hack-without-verification-2021_GM406889139.pdfIn PDF document text
    • https://sktc.se/wp-content/uploads/fsqm-files/free-robux-hack-no-human-verification_GM431946152.pdfIn PDF document text
    • https://sktc.se/wp-content/uploads/fsqm-files/haktuts-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://sktc.se/wp-content/uploads/fsqm-files/coin-master-free-spins-link-2021-today_GM406889139.pdfIn PDF document text
    • https://sktc.se/wp-content/uploads/fsqm-files/robuxy-com-free-robux_GM431946152.pdfIn PDF document text
    • https://sktc.se/wp-content/uploads/fsqm-files/minecraft-java-free_GM479516143.pdfIn PDF document text
    • https://sktc.se/wp-content/uploads/fsqm-files/how-to-get-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • https://sktc.se/wp-content/uploads/fsqm-files/free-spin-in-coin-master_GM406889139.pdfIn PDF document text
    • https://sktc.se/wp-content/uploads/fsqm-files/how-to-get-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • https://sktc.se/wp-content/uploads/fsqm-files/coin-master-free-spin-link-today-2021_GM406889139.pdfIn PDF document text
    • https://sktc.se/wp-content/uploads/fsqm-files/free-robux-generator-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • https://sktc.se/wp-content/uploads/fsqm-files/robux-free-com_GM431946152.pdfIn PDF document text
    • https://sktc.se/wp-content/uploads/fsqm-files/como-hackear-conta-de-roblox_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005200.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5200 24532 bytes
SHA-256: 311a131e3c5c35971b7f26b319b75e89cd967aa78b04d9bc85058dc16cd0494b
font_01_sfnt_off00008a37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8A37 19540 bytes
SHA-256: 2cc2c311c81e9185f8dbb9e9df75f678b7bddce1b76f80632fe3ce387e48a68d

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